Sony WM-W800 User manual

SERVICE MANUAL
US Model
Canadian Model
AEP Model
UK ModeI
SPECIFICATIONS
Tape track 4-track 2-channel stereo
Fast winding time Approx. 3min. with Sony cassette HF-60
Frequency response Deck A {Dolby NR OFF): 40-15,000 Hz
Deck B: 60-9,000 Hz
Input
External microphone input (stereo minijack) (PLUG IN POWER)
sensitivity 0.35 mV (-67 dB) for low impedance microphone
Output
Headphones jack (stereo minijack)
load impedance 8-300 ohms
Power output
. 8 mW + 8 mW (at 10% harmonic distortion) at dc operation
Power requirements 3 V dc
Two IEC designation R6 batteries (size AA)
DC IN 3 V jack accepts:
Sony AC-D2 ac power adaptor (optional)
(US, Canadian) . . .120 Vac, 60 Hz
(AEP).. . .220 Vac, 50 Hz
(UK).. .240 Vac, 50 Hz
Sony EBP-500 battery case (optional) for use on two IEC designation
R20 batteries (size D)
Sony DCC-70 car battery cord (optional) for use with 12 V car battery
Battery life (EIAJ) (hours)
Batteries
Tape
playback
Recording
(microphone)
Supplied Sony SUM-3(NS)
New Super batteries
Approx. 6 Approx. 4
Sony Eveready AM3
alkaline batteries
Approx. 12 Approx. 8
For maximum performance we recommend the use of alkaline batteries.
Dimensions
Approx. 116x88.7x38.2mm (w/h/d) incl. projecting parts and controls
(4% x 3 V 2 x 1 9 / 16 inches)
Approx. 114x84.8x36.2mm (w/h/d) not incl. projecting parts and controls
(4V 2 x 3% x 1 7 / 16 inches)
Weight
Approx. 350 g (12.4oz) incl. batteries, not incl. other accessories
Tape Transport Mechanism Type
MT-W800(A)-25 (DECK A)
MT-W800(B)-25 (DECK B)
FEATURES
• Double-cassette WALKMAN which can copy a recorded
tape on deck A to a tape on deck B.
• Small-size one-point stereo microphone supplied.
• Dolby NR system reduces tape hiss noise in the playback
mode on deck A.
• PB EQ (playback equalizer) selector on deck A for
optimum playback with standard tapes as well as high-per¬
formance metal tapes.
• MIC (PLUG IN POWER) jack supplies power to the sup¬
plied microphone.
'Dolby' and the double-D symbol are the trade marks of
Dolby Laboratories Licensing Corporation. Noise reduction
system manufactured under license from Dolby Laboratories
Licensing Corporation.
STEREO CASSETTE CORDER

WM-W800
SERVICING NOTES
Replacing chip components
All chip components should be connected and disconnect¬
ed, using a tapered soldering iron [temperature of the iron
tip: less than 280°C (536°F)], a pair of tweezers and braid¬
ed wire.
Precautions for replacement
1. Do not disconnect the chip component forcefully.
Otherwise, the pattern may peel off.
2. Never re-use a disconnected chip component. Dispose of
all old chip components.
3. To protect the chip component, heating time for attach¬
ing the component should be within 3 seconds.
o Removing chip components
(1) R emoving solder at electrode
Remove the solder at the electrode, using a thin
braided wire. Do not remove the solder of the part
(chip component) attached adjacent to the electrode.
(2) D i sconnecting chip components
Turn the tweezers with the soldering iron alternately
applied to both electrodes, and the chip component
will be disconnected. Take careful precautions while
disconnecting, because if the chip component is force¬
fully removed the land may peel off.
Never re-use a disconnected chip component.
(3) S moothing the soldered surface
After disconnecting the chip component, remove the
solder by using a braided wire to smooth the land
surface.
o Connecting chip components
The value of chip components is not displayed on the
main body. Take due precautions to avoid mixing new
chip components with other ones.
(1) A pplying solder to land on one side
Apply a thin layer of solder to the land on one side
where the chip component is to be connected. Too
much solder may cause bridging.
Small quantity of solder
(2) S peedy soldering
Hold the chip component at the desired position,
using tweezers, and apply the soldering iron in the
arrow-marked direction. To protect the chip compo¬
nent, heating time should be within 3 seconds.
(3) S p eedy soldering of electrode on the other side
Solder the electrode on the other side in the same
way as in (2) above.
— 2 —

WM-W800
PARTS IDENTIFICATION
Deck A
O Cassette compartment (deck A)
O 0 Headphone jack (stereo minijack)
©MIC (microphone) (PLUG IN POWER) jack (stereo mini-
jack)
© PB EQ (playback equalizer) selector
© ISS (Inteference Suppress Switch)/DOLBY NR selector
© PUSH OPEN button
© Battery compartment
operation buttons on deck A
© PLAY (playback) button
© STOP button
© « ( fast-forward) button
0 ► ► (rewind) button
© Cassette compartment (deck B)
© DC IN 3 V (external power input) jack
© VOL (volume) control
© PAUSE switch
©OPR/BATT (operation/battery) indicator
operation buttons on deck B
© REC (record) button
© PLAY (playback) button
© STOP button
© (fast-forward) button
© ►► (rewind) button
3

WM-W800
SECTION 1
BLOCK DIAGRAM
4

SECTION 2
DISASSEMBLY
• Follow the disassembly procedure in the numerical order given.
• Assemble in the reverse order of disassembling.
CONTROL PANEL COVER
control pane / cover
CONTROL PANEL
control pane!
0 precision screw
PI.4 x 4 /
0 precision screw
Ml.4 x 4
O step screw fS\/Q
M1.4\ J PIT
^ 1
- ;<jp step screw
A M1.4
CASSETTE LID (B)
cassette lid (B)
precision screw
CASSETTE LID (A)
cassette lid
@ precision screw
+P1.4 x 1.6
WM-W800 WM-W800
+P1.4 x 3.5
T lever bracket
SIDE PANEL
J
side panel
DECK B
0 precision screw Ml.4
0 precision
AUDIO BOARD/DECK A
0 chassis fitting shaft (B)
0 chassis fitting shaft (B)
audio board
*4 ^
:o)j/
■ vs*

WM-W800 WM-W800
HEAD CHASSIS (Deck A)
REC LEVER
(Deck B only)
REC lever
0 tension spring
/
0 x© precision screw+P1.4 x 2.0
fV^© REC lever spacer
CONTROL PLATE lever stopper (C)
spring j
precision screw /\. I
+P1.4 x 2.0 / V // \
© Loosen the screw.
SLEEVE
T REEL
precision screw
+P1.4 x 1.8
07.2 washer
precision screw
+P1.7x 2.0
control plate
Installation (1)
BUTTON GUIDE
button collar
V'
button guide
servo board
S901/S902
installation (2)
HEAD CHASSIS (Deck B)
take-up reel
<t>2.5 washer
^ Spread the contact
I point of reel switch
with a pair of tweezers.
PI.4 x 1.4\
head & ?
chassis ERASE head 11 <55! ?E^ = ”
1 joint (A)
0 stopper
washer
1 /
reel switch
(| lock screw
/ h e ad
chasste^
© spring
(Installation)
pinch lever
07.2 washer ■
head chassis -
pinch lever '
shaft
(Head Wiring)
sprins *&> h ead
— grounding
1 plate
adjustment
© pinch lever
© pinch lever .u
azimuth adjustment screw
© precision screw
\ T +P1.4 x 1.4
shut-off spring
stopper washer
+ precision screwdriver
head chassis
head chassis / ^ c/s/o „
sprmg *
head chassis
-151 pinch lever shaft

SECTION 3
ADJUSTMENTS
WM-W800
PRECAUTION
1. Clean the following parts with a denatured-
alcohol-moistened swab:
REC/PB head pinch roller
capstan rubber belts
erase head
2. Demagnetize the REC/PB head with a head
demagnetizes
(Take care not to demagnetize the erase head.)
3. Do not use a magnetized screwdriver for the
adjustments.
4. The adjustments should be performed with the
rated power supply voltage (2.5V) unless other¬
wise noted.
3-1. MECHANICAL ADJUSTMENTS
Pinch Roller Pressure Measurement
Procedure:
— playback mode —
1. Pull the spring scale in the direction of the arrow.
2. Slowly return the pinch roller and read the spring
scale just when the pinch roller starts to rotate.
Specifications:
150 ± 20g
Torque Measurement
Perform with 2.5V DC power.
Torque
meter
Meter reading
FWD
CQ-102C
20 -40 g-cm
(0.28 - 0.56 oz-inch)
FF, REW
CQ-201B
More than 60 g-cm
(More than 0.83 oz-inch)
Back
Tension
CQ-102C
0 - 2.5 g-cm
(0 — 0.034 oz-inch)
Tape Pulling
Force
CQ-403
More than 45 g-cm
(More than 0.62 oz-inch)
Thrust Clearance Adjustment
Thrust clearance
Adjustment Parts
(Refer to exploded
views and parts list.)
Motor wheel
0.2mm
No. 114
Take-up reel
0.05-0.15mm
No. 108/110/111
Supply reel
0.05-0.15mm No. 117
Reverse wheel
0.05-0.15mm
No. 152/154
reverse wheel
- 9 -

WM-W800
3-2. ELECTRICAL ADJUSTMENTS
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: playback
test tape
P-4-A063
(6.3kHz, - 1 0 dB)
VTVM
czT
LXj-Ll_J
^ HEAD PHONES
2. Turn the adjustment screw for the maximum
output levels. If these levels do not match, turn
the adjustment screw until both of output
levels match together within 0.5dB.
.x within
'output 05dB
level j
screw
position
Phase Check
Mode: playback
test tape
P-4-AQ63
(6.3kHz, -10dB)
Note) After the
adjustments, do not
apply locking compound.
oscilloscope
Y" | R-CH ^
HEADPHONES hl8n
□
j/h
—O pO
L t-i J
wt m
Screen pattern
Of\
Tape Speed Adjustment
Setting:
VOLUME control: mechanical mid
Procedure:
Mode: playback
test tape
WS-48A
(3kHz, OdB)
speed checker
LFM-30
or
digital frequency
counter
0
—,_) i
r -
-O 0 |
HEADPHONES
Specification:
Deck A
3,000 - 3,020Hz (3,010 ±0.3%)
Deck B
2,980 - 3,000Hz (2,990 ±0.3%)
Adjustment Location:
fast
Deck A w
tape speed \
adjustment J
RV601 *
slow
Deck B
tape speed
adjustment
RV701
in phase 45 0 gp° 735 ° 180°
good wrong
10 -

WM-W800
Dolby NR Level Adjustment
Setting:
TAPE switch: NORM
DOLBY NR switch: off
VOLUME control: minimum
test tape
P-4-L300
(315 Hz, OdB)
n
Procedure:
Adjust RV101 (L-CH), RV201 (R-CH) to obtain
—27.7dB ±0.5dB (0.030V to 0.033V) output
level.
Adjustment Location: Audio board

WM-W800
RECORD BIAS ADJUSTMENT
Setting:
VOLUME control: MECHANICAL MID
Procedure:
1. R e c o rding Mode (Deck B)
onoOoo'T
blank tape
CS-10
600n / ^ ■
MIC '
250Hz ]
315Hz | 0.0775m V (~80dB)
6.3kHz
2. P layback Mode (Deck B)
recorded portion
i it
3. S p e c ifications
250Hz 315Hz 6.3kHz
If necessary, change resistor connection and
repeat the above step 1 through 3.
o mark: pattern bridge
LOW
R316
R317
o o
o
o
Adjustment Location: Audio board
R317 %
1316
Bridge with solder.
—12